ISO 2553:2013 pdf free download.Welding and allied processes – Symbolic representation on drawings Welded joints.
The symbols given in this standard can be used on technical drawings for welded components. Design- related specifications, such as type, thickness, and length of weld, weld quality, surface treatment, filler material and testing specifications, can be indicated directly at the weld by means of the symbols given In ISO 2553. The principals of this standard can be applied to brazed and soldered joints.
Clarity may be improved by references to collective information In the drawings or references to additional design-related documents.
Preparation for production may require detailed welding-related planning. The type of representation described in ISO 2553 can be used for this purpose and complemented by additional production- related information (e.g. welding position, welding process, WPS, weld preparation, preheating …). This information is often given In production-related documents, such as work schedules or welding procedure specifications (WPS).
Technical drawings are Intended to clearly and understandably illustrate design-related specifications. Welding-related drawings should be prepared andchecked byspeclally trained personnel (see ISO 14731).
This edition of ISO 2553 recognizes that there are two different approaches in the global market to designate the arrow side and other side on drawings, and allows for either to be used In isolation, to suit a particular market need, Application of either approach identifies a welding symbol In accordance with this International Standard. The approach in accordance with system A is based on ISO 2553:1992. The approach In accordance with system B Is based upon standards used by Pacific Rim countries.
ISO 2553 defines the rules to be applied for symbolic representation of welded joints on technical drawings. This may include information about the geometry, manufacture, quality and testing oI’the welds. The principles of this standard may also be applied to soldered and brazed joints.
It is recognized that there are two different approaches in the global market to designate the arrow side and other side on drawings. In ISO 2553:
— clauses, tables and figures which carry the suffix letter are applicable only to the symbolic representation system based on a dual reference line;
— clauses, tables and figures which carry the sultix letter “13” are applicable only to the symbolic representation system based on a single reference line;
— clauses, tables and figures which do not have the suffix letter A or “B” are applicable to both systems.
The symbols shown in ISO 2553 may be combined with other symbols used on technical drawings. for example to show surface finish requirements.
An alternative designation method is presented which may be used to represent welded joints on drawings by specifying essential design information such as weld dimensions, quality level, etc. The joint preparation and welding process(es) are then determined by the production unit in order to meet the specified requirements.
NOTE Examples given in this International Standard, including dimensions, are Illustrative only and are intended to demonstrate the proper application of principles They are not intended to represent good design practices, or to replace code or specification requirements.
2 Normative references
The following documents, in whole or In part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 128 (all parts), Technical drawings — General principles of presentation
ISO 129-1. TechnIcal drawings — Indication of dimensions and tolerances — &irt 1: General principles
ISO 1302, Geometrical Product Specifications (GPS) — Indication of surface texture in technical product documentation
ISO 3098-2. Technical product documentation — Lettering — ParC 2: Latin alphabet, numerals and marks
ISO 4063, Welding and allied processes — Nomenclature of processes and reference numbers
ISO/TR 25901:2007, WeldIng and related processes — Vocabulary
3 Terms and definitions
Forthe purposes of this document, the terms and delinitionsgiven in ISO/TR 25901 and the following apply.
5.4.2 Double-sided welds
In double-sided butt welds, each weld shall be separately dimensioned.
NOTE Full penetration symmetrical butt welds do not need to be dimensioned.
5.43 Flanged butt welds
Flanged butt welds are always full penetration welds (the raised edges are completely melted). These welds require no dimensioning.
5.4.4 Flare bevel and flare-V butt welds
Flare bevel and flare-V butt welds shall always be dmensioned. Examples of how to dimension these types of weld are given in TableS. No 1.6 and 1.7.
5.5 Fillet welds
5.5.1 Weld size
The letter, a. nominal throat thickness, or z. leg length, shall be placed in front or the dimension to the left of the elementary symbol (see TabIe 5. No. 2.1).
For fillet welds with unequal leg lengths the dimensions of each leg shall be included, preceded by the letter z, e.g. zi4 z28. lithe required leg lengths cannot be identified clearly using the welding symbol, additional sketches or indications shall be given on the drawingor In other documents. See TableS. No, 2.3,
For fillet welds made on both sides of a joint, the dimensions of both welds shall be specified even if they are identical (symmetrical).
5.5.2 Deep penetration fillet welds
The letter. s, shall be placed in front of the required deep penetration throat thickness. This shall he placed in front of the nominal throat thickness, a, and its dimension as shown in Table5. No. 2.2.
5.6 Plug welds In circular holes
The diameter symbol, d, shall be placed in front of the required plug weld diameter at the laying surface. and to the left oithe plug weld symbol (see TableS. No. 3).
liplug welds are to be partially Iillel, the depth of filling shall be indicated inside the elementary symbol. In the absence of a depth dimension, the plug shall be completely filled (see TableS. No.11 and No. 3.2).
Intermittent welds shall be designated additionally with the number, and centre-to.centre spacing of welds to the right of the elementary symbol (see Tahk.S. No. 13).
5.7 Plug welds in slots
The required weld width. c. at the faying surface, shall be placed to the left of the plug weld symbol (see Table 5. No. 4).
If plug welds are to be partially tilled, the depth of filling shall be indicated inside the elementary symbol (see TableS. No. 4.2). In the absence of a depth dimension, the slot shall be completely filled.
Intermittent welds shall be designated additionally with the number, length and spactngofweld elements to the right of the elementary symbol (see TableS. No.4.3).
NOTE The plug weld symbol is not used to designate lillet welds in holes or slots.